these 3 derivations will be built:
  /nix/store/s7v4wc8ly3xq9jvbwmj8v2v1j0p12dw5-source.drv
  /nix/store/b93piz3j5h4fyn63h958f1wy1kz7awhy-harmonia-deps-3.2.0.drv
  /nix/store/36j5narc0ibdv3953ci24shjcb9j1z4q-harmonia-3.2.0.drv